2014-10-17_PERMIT FILE - C1981035A (3)

Home Browse Search

PART I Pap Na t Pemdt Na COG- 5000 testing results for the fast calendar quarter ending March 31 shall be reported with the due April 28.) The results shall be submitted on the Chronic Toxicity Test report form, available from the Division. Copies of time reports are to be submitted to the Division along with the DMR. The permittee shall conduct each chronic WET test in general accordance with methods described in Short Term Methods for Estmating the Chronic J=W of EPA/600/4-89 /001 or the most current edition, except as modified by the most current Division guidance entitled Giuidelines for CondnCtint Whole Effluent Tg3= Tests. The permittee shall conduct such tests using Ceriodaph�ia dubia and fathead minnows. 2. Failure of Test and Division Notification A chronic WET test is failed whenever 1) there is a statistically sipifiicant difference in lethality between the control and any effluent concentration less than or equal to the instteam waste concentration (IWC) 2) the ICu, which represents an estimate of the effluent concentration at which 25% of the test organisms demonstrate innbition as reflected by lethality, is at any effluent concentration less than or equal to the IWC. The permittee uarst provide written notification of the failure of WET test to the Division, along with a statement as to whether a Preliminary Toxicity Investigation (PTI)lroxicity Identification Evaluation ( TIE) or accelerated testing is being performed (see Part 12.7.k.). Notification must be received by the Division within 21 calendar days of the demonstration of chronic WET in the routine required test. Demonstration means no later than the last day of the laboratory test. c. Other WET Testing Requirements Applicable to both Chronic and Acute WET Testing 1. Automatic Compliance Schedule Upon Failure of Test If a routine chronic WET test is failed, regardless of whether the limit is in effect, the following automatic compliance schedule shall apply. As part of this, the permittee shall either: i. Proceed to conduct the PTYM investigation as described in Part LB.7.c., or I Conduct accelerated testing using the single species found to be more sensitive. If accelerated besting is being performed, the permittee shall provide written notifications of the results within 14 calendar days of completion of the Pattern of Toxicity/No Toxicity demonstration. Testing will be at least once every two weep for up to five tests until; 1) two consecutive bests fail or three of five tests fail, in which case a pattern of toxicity has been demonstrated or 2) two consecutive tests pass or three of five tests pass, in which case no pattern of toxicity has been found. If no pattern of toxicity is found the toxicity episode is considered to be ended and routine testing is to resume. if a patters of toxicity is found, a PTVM investigation is to be performe& If a pattern of toxicity is not demonstrated but a significant level of erratic toxicity is found, the Division may require an increased frequency of routine monitoring or some other modifed approach. Iraff—JAW The results of the PTMU investigation an to be received by the Division within 120 days of the demonstration of chronic WET in the routine test, as defined above, or if accelerated testing is performed, the date the pattern of toxicity is demonstrated. A status report is to be provided to the Division at the 30, 60 and 90 day (points of the PTUM investigation. The Division may extend the time firame for investigation where reasonable jusstififcstiozi exists. A request for an extension must be made in writing and received prior to the 120 day deadline. Such request must include a justification and supportin data for such an extension. The permittee may use the time for investigation to conduct a PTI or move directly into the TIE. A PTI consists of a brief search for possible sources of WET, which might reveal causes of such toxicity and te corrective actions more simply and cost effectively than a formal TIE. If the PTI allows resolution of the WETncident, the TIE need not necessarily be conducted. If, however, WET is not identified or resolved during the PTA, the TIE must be conducted within the allowed 120 day time fi$me. Any permittee that is required to conduct a PT VTIE investigation shall do so in conformjiance with procedures identified in the following documents, or as subsequently updated: 1) Toxicity Identification Evaluation: Characterization of Chronicall Toxic Effluents, Phase I, EPA/600/6- 91/005F May 92, 2) Methods for Aquatic Toxicity, Identification Evaluations, Phase I Toxicity Characterization Procedures, EPA/600 /6- 91/003 Feb. 91 and 3) Methods for Aquatic Toxicity Identification Evaluations, Phase II Toxicity Identification Procedures, EPA/600/3-8&'035 .Feb. 1989. A fourth document in this series is Methods for Aquatic Toxicity Identification Eval»attons, Phase III Toxicity Confnrmatit Procedures, EPA/600/3- 88/036 Feb. 1989. As indicated by the title, this procedure is in tended to confirm that the suspecte<